Portable fan



FIG. 1 is a top plan view of a portable fan showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevation view thereof, the opposite side being a mirror image of that shown;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a top plan view thereof with the blades in resting position; and,

FIG. 7 is a front elevation view thereof with the blades in resting position. 

The ornamental design for a portable fan, as shown and described. 